It is included with the package Cylinder, Threaded - M18 to simplify your life. It is possible for proximity sensors to function well at -25°C~70°C. Proximity sensors should have their supply voltage set to 30V for maximum effectiveness. To make the proximity sensors work properly, the internal contacts of the reed switch must pass 200mA. For DC circuits, proximity sensors can handle voltages as high as 30V without causing damage. There shouldn't be a current lower than 10V in the DC circuit of proximity sensors.